Trader Thomas McCauley, left, and specialist Donald Civitanova work on the floor of the New York Stock Exchange, Friday, May 23, 2014. Stocks inched higher early Friday in quiet trading ahead of the Memorial Day weekend. (AP Photo/Richard Drew) ORG XMIT: NYRD102

Trader Christopher Fuchs, right, works on the floor of the New York Stock Exchange, Friday, May 23, 2014. Stocks inched higher early Friday in quiet trading ahead of the Memorial Day weekend. (AP Photo/Richard Drew) ORG XMIT: NYRD103

Photo: Richard Drew

Trader Christopher Fuchs, right, works on the floor of the New York...

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Trader Neil Catania, right, works on the floor of the New York Stock Exchange, Friday, May 23, 2014. Stocks inched higher early Friday in quiet trading ahead of the Memorial Day weekend. (AP Photo/Richard Drew) ORG XMIT: NYRD106

Photo: Richard Drew

Trader Neil Catania, right, works on the floor of the New York...

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Trader Gregory Rowe works on the floor of the New York Stock Exchange, Friday, May 23, 2014. Stocks inched higher early Friday in quiet trading ahead of the Memorial Day weekend. (AP Photo/Richard Drew) ORG XMIT: NYRD107